Inclosed safety-fuse.



A, L. :usme.

INCLOSED SAFHY FUSE.

APPLICATION FILED MAY 3. I915.

Patented June 25, 1918.

To all 'whom it may concern:

UNITED STATES PATENT OFFICE.

ALFRED L. EUSTICIl, OF CHICAGO, ILLINOIS ASSIGNOR T0 ECONOMY FUSE & MANUFAC- TUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

-INCLOSED sarn'rmrusn.

Speeificationot Letters Patent.

Patented June 25, 1918.

Application flied Kay 3. 1915. Serial No. 25,344.

Be it known that I, ALFRED L. EUSTICE, a citizen of the United States, residin at Chica o, in the county of Cook and tate of Illinois, have invented certain new and useful Improvements in Inclosed Safety- Fuses, of which the following is a specifica tion.-

My invention relates to cartridge fuses for the protection of electrical circuits, and refers particularly, although not exclusively, toienewable cartridge fuses of the so-called ferrule type. L i

In my co-pending application, Serial No. 852,557, filed J uly 23;1914, I have described a' cartridge fuse in which the ferrules loeat'ed at the ends of the insulating casing are provided with inwardly-extending abutment flanges, which, in turn, are engaged by apertured t vashers' through whic the ends of the fusible. link extend, these ends being clamped in. osition and the washers being'forced into rm engagement with the abutmentfianges by means of plugs which screw into the ends of the ferrules.

- I have found that considerable diiliculty and expense are entailed in the manufacture simplicity of manufacture,

' ing of ferrules of the type just described which have inwardly-extending abutment. flanges formed integral therewith, and it-is'one of the objects of my invention to increase the and'thereby decrease the cost by construct-in withseparate abutment thimb es, on each of which is formed an inwardly-extending abutment flange, the abutment thimhls beassemhled with sleeves of the ferrules sothat in their adiiusted position a unitarystructure is forme A. further object of my invention consists in the provision of means by which the washers at the end of the fuse will be alined; in predetermined'positions so that 'the'fuse link which extendsbetween these washers must be maintained in proper position wit respect to the fuse easing.

still further ohjeet of my invention consists in improved means for attaching the:

ferrules to the casing, this means consisting in erim ing the inner edges of the ferrules into su1 able grooves formed in the casing of the fuse.

the ferrules These and other advantages of my inven tion willhe more readily understood by' reference to the accompanying drawings, in which Figure l is a longitudinal section through my improved cartridge fuse;

Fig. 2 is a longitudinal section of the fuse shown in Fig. 1, and taken on the line 22 thereof;

Fig. 3 is a longitudinal section of a fer rule sleeve before it has been applied in position on the fuse casing;

Fig. 4 is a longitudinal section through one of the abutment thiinbles before it. has

Fig. 7 is a transverse section taken on the;

line '77 of Fig. 2;

Fig. 8 is a transverse section liiie 8-8 of Fig. 2; and

Fig. 9 is a side elevation of the fuse c astaken on the ing before the ferrules have been applied,

thereto.

The fuse casing 20, of fiber or other suitable insulating material, is provided near its ends with the grooves 21. Each of the ferrules applied to the ends of the casing 20 p 3 consists of three members: first, the abut;

mentthimhle 22, second, the ferrule sleeve 23, and, third, the ferrule plug 24. In as sembling the various partsof the fuse which remain permanently in position the abutment thimbles 22, in the shape in which'they are shown in Figs. 4 and 5, are slipped over the. ends of the casing 20 with which they have a tight fit. the inwardly-extending abutment flange 25 of each thimhle being brought into snug engagement with the cor-- responding end of the (using 20. From each abutment flange 25 an alinemeut tongue 9.6 (the object of which will be explained hereafter) has been upset, the alinement tongues 26 at opposite ends of the casing 20 being located diametrically opposite tocach other. The ferrule sleeves 23, in the form in which they are shown in Fig. 3, are then slipped' into position so that they embrace the outer surfaces of the abutment thimbles 22, these ferrule sleeves being moved inwardly until the shoulders .27 thereon engage t'nabutment flanges 25 ofthe abutment thimbles 2' the shoulders 27 being loeated between the threaded portions 2H of the ferrule sleeves 23 and the inner plane skirt portions :29

thereof. 1

The next operation is torrimp the inner edges of theabutment tlliln les 22 and the ferrule sleeves 23 into the positions in whieh they are shown in l"igs. l aml 2. so that the inwardly-extei'nling loelcing llanges 3H" and 31'. are thereby formed on tin-abutment thimbles :22 and the ferrule sleevesZ-l. respeetively. these lm lting llanges engaging the grooves 21 in the easing 20.

The parts whieh l have just deseribed. t1 wit, the abutment thimbles 2:. and the ferrule sleeves 23, are thus wrmanently fastened to the fuse. easing'EZt). The remaining parts of the fuse whieh will now be de seribed are removably plaeed in position so that onblowing of the fuse these parts ma v readily be removed and anew fuse lint plat-ed in position.

A washer 3.0 provided with an alinelnent ret ess 3] in its periphery engages the abutment llange zlfi in eaeb of the ferrules, 'l'he alinement tongues 26 of the abutment flanges 25 extend into the alinement reeesses ilfand art-'of slibstantially thesame width a ssaid lm't'ssts, so that it will be evident that. the washers 30 ean be plared' only in "a single predetermined position and are etl'ellually prevented from rotating by the engagement of the sides of the alinement tongues 26 with the sides of the alinement reresses 3t.

The llat fusible link it) extends diagonally through the easing 20. and through eaeh of the aliueinent reeesses Ill. the ends --l of the link 32 being bent'ovei' the outer fares of the washers 30. \s most elearly shown in Fig. 1, the thirkness ofthe link 3%." whirli is enpable of being used in the fpse is limited hy the distan -e between the inner edges of the alinemeut tongues Qtt-aiid the bases of thealineinenlreeesxes 31. it thereby beeoming impossil ile to use in any part'ienlar fuse eas ing a link whiehis of'grea'ter thiekness than is proper for sin-h l'nse easing.

The ferrule plugs 2| having the slots 31 in their outer 'ends' are serewed into the threaded ends 28 ol'vihe ferrule fsleeves 23 until the inner surfaces of these ferrule plugs e llie l ii -nt -over ends 33 of the link 3;; 'hen thisitall'ies' pla -e. ittwill be evident that the \vaslieljstlll are firmly forred against "naabntment llanges and all of the parts are lirmly held in position. There is a slight 'nre bet ween the threads of the ferrule plugs .l and; the threads of the outer por tioiis 2 of the ferrule sleeves 23 in order to a form i'estrieted pas'i 'es for the eseape ofgaseswhen the fuse n. 'l'la-apertlm-s 35 are preferably provided in the ferrule ngage.

plugs 24 in order that the rating numbers 36 plared on the bent-over ends 33 of the link 3:! may be l'eadilyw'isilile.

Afte' a fuse has been blown. thereby destroying'the fuse link 3:5. it will be evident that the latter may be readily renewed by first removing the ferrule plugs 24 and then removing the washers Ill). after whi'eh a new link 3:! may be plaeed in position within the easing J0. tl e washers 10 then brought into the positions shown in Figs. 1 and L. the ends 33. of tlle links bent over the outer surfaces V of the washers t". aml the ferrule plugs 24 then serewed home. as above deseribed.

It will be apparent to those'slv'illed in the art that many ('lltlllgt's eould be made in the detailed ronstri etion ot' the various parts \vhieh 1' have described without departing from the spirit or st'ope of my invention.

'hat I rlaim is:

1. In an im'losed-safety fuse. the eombination of a casing. a ferrule at the end of said easing. a. washer within said ferrule aml havluga reeess in its peripherv, a fuse link having its end elamped between the outer fare of said washer and said ferrule. an abutment llange within. id ferrule and against which sa id washer i eated. andan al'ineaient.tongne formed in i aid abutment "flange and engaging the reeess of said 'washer.' whereby the latter is alined in a preilelermined position.

2; in an inrlosed safety fuse. the eombinatlotrol' aeas ngtan abutment thnnble lit-- 7 tuigover the eml of said easing. said abut.-

meiit th'in ble having an inwardly-extenrl-- ,ment reeess in its periphery, said alinementi reeess being engaged by aid alinement tongne. afusible ll-llli within said easing and extendii'ig through the reeess of said washer, the end of said link being bent, over. the outer l'aee-ot' said washer. and a ferrule plug ha ring threaded engagement with the outer portion of said ferrule sleeve and'bearing against 'the bent-over end of said link, whereby the latter is se -"rely elan'iped in position between the outerface of said -washe' and said plngvaad the washer is brought into lirm engagement with said abutment llange.

3. ln an inelosed safety fuse, the eombination of a easing having an exterior groove near its endQan abutment. thiinblelitting.

over the end oisaid easing. said abutment;

thimble ha vingan inwatally-extending abut.- menl llange engaging the end ofsaid casing, a ferrule sleeve. fitting over the abutment and a plug having engagement with the thimble, the inner edges of said abutment 'thimble and said ferrule sleeve being crimped into the groove of said casing whereby said abutment thimble and said ferrule "sleeve are locked in position, a washer within said ferrule sleeve and engaging the abutment flange of said abut- .qment thimble,said washer having an aperclamped securely, against said washer and "said'washer, the end of ,said link over the outer face of said washer, and a plug fitting within the outer end of said .xferrule sleeve andengaging' the bent-over ture therein, a fusible link within said casing and passingthrough the agerture of .eing bent end of said link, whereby the latter is the washer is brought into firm engagement with said abutment flange.

4 'In an inclosed safety fuse, the combination of a casing, an abutment thimble fitting over. the end of said'casing, said abuti mentthimble having. an inwardly-extending abutment flange engaging the end of the casing, a ferrule sleeve abutment thimble and having a shoulder engaging said abutment flange, said ferrule of said sleeve'h'aving its outer portion interiorly threaded, a washer within the outerjpo rtion ferrule sleeve and engaging said abutment-"flange, said washer having an aperturetherethrough, a fusible link within: said casing and passingthrough the aperture of said washer, the end of said link be ing bent over theouter face of said washer,

threaded interior of the outer portion of said ferrule sleeve and bearing against the i bent-over end of said link, whereby the latter is securely clamped in position between fitting over said shoulder engaging the outer end of said abutment thimble, the inner edges of said abutment thim'ble and said ferrule sleeve being crimped into the groove in said easing, whereby said abutment thimble and ferrule sleeve are securely locked in position, a washer within the outer portionof said ferrule sleeve and engaging said abutment flange, said washer having an aperture therethrough, a fusible link within said casing and passing through the aperture of said washer, the end of said link being bent over the outer face of saidyasher, and a plug having engagement with the threaded interior of the outer portion of said ferrule sleeve and bearing against the bent-over end of said link, whereby the latter is securely clamped in position between the outer face of said washer and said plug and the washer is brought into firm engagement with said abutment flange.

In witness whereof, I hereunto subscribe my name this28th day of April, A. D. 1915.

ALFRED L. EUSTICE.

VVitnessesi J. B. Gnn'FrrH,

HENRY M. HUXLEY. 

